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Particle separation in xanthan gum solutions

  • Di Li
  • Xingchen Shao
  • Joshua B. Bostwick
  • Xiangchun XuanEmail author
Research Paper
  • 169 Downloads
Part of the following topical collections:
  1. Particle motion in non-Newtonian microfluidics

Abstract

Label-free separation of particles by an intrinsic property can be implemented in microfluidic devices through either an externally imposed field or an inherent flow-induced force. Among the latter type of passive techniques, elastic or elasto-inertial lift-based particle separation in non-Newtonian fluids has received a rapidly growing interest in the past decade. However, current demonstrations of particle separation in non-Newtonian fluids have all taken place in viscoelastic polymer or biological solutions. We demonstrate for the first time a continuous sheath-free separation of polystyrene particles in the flow of weakly elastic xanthan gum (XG) solution through a simple straight rectangular microchannel. This separation is fundamentally different from that in the flow of viscoelastic solutions. We explain the observed particle migrations in XG solutions using the competition of a strong wall-directed (because of the strong shear thinning effect) and a small center-directed (because of the weak elasticity effect) lateral force induced by normal stresses in a Poiseuille flow.

Keywords

Particle separation Lateral migration Lift force Shear thinning Elasticity Microfluidics 

Notes

Acknowledgements

This work was supported in part by Clemson University through a SEED Grant (XX), and by NSF under Grant Number CBET-1750208 (JB).

Supplementary material

10404_2019_2292_MOESM1_ESM.pdf (1.1 mb)
Supplementary material 1 Experimental images for particle motion in the flow of Newtonian and non-Newtonian fluids over a wide range of flow rates (PDF 1150 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringClemson UniversityClemsonUSA

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